Ios 在完成UIView动画之前，在完成块中执行代码

单击按钮后，我想将视图旋转180度。动画后，我想隐藏和显示图像和标签。但隐藏和显示图像和标签的完成代码在动画完成之前执行。检查下面的代码，让我知道我哪里错了吗

var animation = CABasicAnimation(keyPath: "transform.rotation.y")
    animation.fromValue = NSNumber(value: 0)
    animation.toValue = NSNumber(value: Double.pi)
    animation.repeatCount = 1
    animation.duration = 5.0

    UIView.animate(withDuration: 5.0, animations: {
        self.viewContainer.layer.add(animation, forKey: "rotation")
    }, completion: { finished in
        if finished {
            if self.strInfo == "Image" {
                self.strInfo = "Info"

                self.lblInfo.isHidden = false
                self.imageView.isHidden = true

                self.btnInfo.setBackgroundImage(UIImage(named:"close"), for: .normal)

            } else if self.strInfo == "Info"{
                self.strInfo = "Image"

                self.lblInfo.isHidden = true
                self.imageView.isHidden = false

                self.imageView.image = UIImage(named: self.strPhotoName)
                self.btnInfo.setBackgroundImage(UIImage(named:"info"), for: .normal)
            }
        }
    })

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将动画添加到层没有等待时间，您需要在动画块内完全创建动画逻辑，例如更改帧或执行此操作

self.viewContainer.layer.add(animation, forKey: "rotation")

DispatchQueue.main.asyncAfter(deadline: .now() + 5.0) {

    if self.strInfo == "Image" {
        self.strInfo = "Info"

        self.lblInfo.isHidden = false
        self.imageView.isHidden = true

        self.btnInfo.setBackgroundImage(UIImage(named:"close"), for: .normal)

    } else if self.strInfo == "Info"{
        self.strInfo = "Image"

        self.lblInfo.isHidden = true
        self.imageView.isHidden = false

        self.viewContainer.backgroundColor = .white

        self.imageView.image = UIImage(named: self.strPhotoName)

        self.btnInfo.setBackgroundImage(UIImage(named:"info"), for: .normal)
    }

}